Classification of configuration differences;
A; White standard version (NE5534)
B; Black Standard Edition (NE5534)
C; White enhanced version (OPA828)
D; Black enhanced version (OPA828)
E; White HIEND version (MUSES03)
F; Black HIEND version (MUSES03)
If you need 110V, just leave me a message The contents of the package are only the host, no power cord, and no other accessories
The circuit is referenced from the Golden Throat 3850 preamplifier. The circuit is a preamplifier that is worth making and admiring. If you do it with your heart, the effect is much better than the general preamplifier. It is looser, more delicate, warmer and charming, because it is classic, far from it. Ordinary tube and op amp can be compared, and the sound can be compared to the timbre of a beautiful tube
The circuit architecture uses the operational amplifier as the basic amplifier. Discrete parts are added to increase the open-loop gain, and the voltage and current dual feedback circuit is used to reduce distortion. The output tube uses the original British tube ZTX450 ZTX550, and the output is in Class A status. The music tastes very good. Bold
NE5534 version: good vocals, strong guts, full low frequency and good musical sense
LME49710 gold-sealed version: good high-frequency details, excellent positioning, and the texture of the instrument is very realistic,
MUSES03 version: real and natural, with the most comprehensive performance, a sense of air, and first-class sound field
There are three versions of the circuit:
Standard version: Philips NE5534 input amplifier, oxygen-free copper 30W R-type transformer
Enhanced version: LME49710HA gold-sealed operational amplifier input amplification, oxygen-free copper 30W R-type transformer
HIEND version: MUSES03 operational amplifier input amplifier, British Talema transformer
External 261 wide 62 high 190 deep
The knob on the left is the input selection switch, which can input 3 signals from 3, the middle is the power switch, and the right is the volume knob.